Established on May 27, 1899, Ross Valley Sanitary District is California's oldest district. The District serves Fairfax, San Anselmo, Ross, Larkspur, Bon Air, Sleepy Hollow, Kentfield, Kent Woodlands, Oak Manor, and Greenbrae. The District operates and maintains approximately 200 miles of collection sewer lines and 19 pump stations, collecting, pumping, and transporting approximately four million gallons of wastewater per day to Central Marin Sanitation Agency for treatment. Approximately 60% of the District's collection system was installed before 1955. The District's mission is to provide our customers with high-quality wastewater collection service through a system with no avoidable sanitary sewer overflows at the lowest sustainable cost to protect public health and the environment.